51 to 75 of 107 Permanent API Design Jobs

Data Architect

Hiring Organisation
Damia Group Ltd
Location
Hounslow, London, United Kingdom
Employment Type
Permanent
Salary
£90,000
Align data architecture with security, compliance, and data governance requirements Lead the evolution of technical architecture documentation, models, and decision records Conduct architecture and design reviews with cross-functional teams Guide teams in the adoption of best practices in API design, modularity, cloud-native patterns, and event … driven systems Recommend data management best practices, covering data flows, architecture patterns, retention, archival, and purging strategies Coach and mentor engineers on data design, refactoring, and architectural reasoning Essential skills and experience: Proven experience designing and scaling enterprise-grade cloud data platforms (AWS preferred) Deep experience with AWS, Databricks ...

Lead Developer

Hiring Organisation
Oscar Technology
Location
Bristol, Avon, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £80,000 per annum
manual test strategies Documenting architectural decisions (ADRs) and maintaining clear technical communication Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (offline-first mobile design) Microsoft Azure (App Services, Azure SQL, Blob Storage, Key Vault, Application Insights … years working within fast-paced, "fail-fast" delivery environments At least 2 years in a leadership position Strong expertise in modern .NET and API design Proven Angular experience (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code (Bicep preferred) Experience integrating Azure Entra ...

Lead Developer

Hiring Organisation
Oscar Technology
Location
Birmingham, West Midlands, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £80,000 per annum
manual test strategies Documenting architectural decisions (ADRs) and maintaining clear technical communication Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (offline-first mobile design) Microsoft Azure (App Services, Azure SQL, Blob Storage, Key Vault, Application Insights … years working within fast-paced, "fail-fast" delivery environments At least 2 years in a leadership position Strong expertise in modern .NET and API design Proven Angular experience (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code (Bicep preferred) Experience integrating Azure Entra ...

Lead Developer

Hiring Organisation
Oscar Associates (UK) Limited
Location
Warrington, Cheshire, North West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£80,000
manual test strategies Documenting architectural decisions (ADRs) and maintaining clear technical communication Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (offline-first mobile design) Microsoft Azure (App Services, Azure SQL, Blob Storage, Key Vault, Application Insights … years working within fast-paced, 'fail-fast' delivery environments At least 2 years in a leadership position Strong expertise in modern .NET and API design Proven Angular experience (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code (Bicep preferred) Experience integrating Azure Entra ...

Lead Developer

Hiring Organisation
Oscar Technology
Location
Newcastle Upon Tyne, Tyne and Wear, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £80,000 per annum
manual test strategies Documenting architectural decisions (ADRs) and maintaining clear technical communication Tech Stack & Experience Core technologies: .NET 10/ASP.NET Core Web API Entity Framework Core with Azure SQL .NET MAUI (offline-first mobile design) Microsoft Azure (App Services, Azure SQL, Blob Storage, Key Vault, Application Insights … years working within fast-paced, "fail-fast" delivery environments At least 2 years in a leadership position Strong expertise in modern .NET and API design Proven Angular experience (v15+) Hands-on Azure architecture and deployment experience Experience implementing Infrastructure as Code (Bicep preferred) Experience integrating Azure Entra ...

Technical Team Lead - eDV Cleared

Hiring Organisation
Forward Role
Location
Cheltenham, Gloucestershire, South West, United Kingdom
Employment Type
Permanent
identify risks, plan deliveries, and support resource allocation Core Focus: Architecture & Integration Cross-domain strategy and secure system integration Java/Spring Boot microservices design and governance Senior technical stakeholder liaison across customer and internal teams What You Bring: Proven experience leading teams in Agile, customer-facing software projects … Experience with one or more of the following: Full-stack web development Software as a Service (SaaS) Mobile application development API design and development Cloud platforms (AWS, Azure, GCP) Front-end development and user experience (UX) Clearance required - Due to the nature of the clients' work ...

Senior Software Engineer

Hiring Organisation
CPS Group (UK) Limited
Location
Cardiff, South Glamorgan, United Kingdom
Employment Type
Permanent
Salary
£60000 - £65000/annum
Java or a similar language is required, with the expectation that Java will feature more prominently at certain stages of development. Key Responsibilities Design, build, and maintain high-quality frontend applications using Angular Contribute to full-stack development across modern, scalable systems Collaborate with backend engineers on APIdesign and integration Work across the full software development lifecycle with a DevOps mindset Apply best practices including CI/CD, automated testing, and clean code principles Operate within an agile team, contributing to continuous improvement and technical decisions Ensure solutions meet security, performance, and quality standards Key Skills ...

Software Engineer

Hiring Organisation
CPS Group (UK) Limited
Location
Cardiff, South Glamorgan, United Kingdom
Employment Type
Permanent
Salary
£55000 - £65000/annum
Java or a similar language is required, with the expectation that Java will feature more prominently at certain stages of development. Key Responsibilities: * Design, build, and maintain high-quality frontend applications using Angular * Contribute to full-stack development across modern, scalable systems * Collaborate with backend engineers on APIdesign and integration * Work across the full software development lifecycle with a DevOps mindset * Apply best practices including CI/CD, automated testing, and clean code principles * Operate within an agile team, contributing to continuous improvement and technical decisions * Ensure solutions meet security, performance, and quality standards Skills Required ...

Staff Software Engineer

Hiring Organisation
Classic Football Company Ltd
Location
Manchester Area, United Kingdom
collaborative Agile environment. You will take ownership of complex Magento and front-end initiatives, influence technical direction, and work closely with Product, Design, and Operations to ensure our platforms remain scalable, secure, and high-performing. Location: Hybrid/Remote flexibility Hours: The role is a full-time position … Responsibilities: Lead the design, development, and maintenance of Magento 2 (PHP) features, modules, and integrations, including REST and GraphQL APIs. Drive front-end development using React (JavaScript/TypeScript), consuming Magento GraphQL endpoints to deliver high-quality customer experiences. Own technical solutions from concept through to production, ensuring quality ...

Senior Backend Developer (.NET | AI-First SaaS Platform)

Hiring Organisation
Keepnet
Location
United Kingdom
that power these systems, working in a multinational, AI-first engineering team where quality, ownership, and long-term thinking matter. What You’ll Do Design, build, and maintain scalable backend services for Keepnet’s Human Risk Management platform. Build clean, modular APIs that integrate internal services and third-party … enable automation, reporting, and security workflows. Develop testable, maintainable codebases using principles such as Clean Architecture, DDD, and TDD. Own the full development lifecycle : design, implementation, CI/CD (Azure), and post-release monitoring. Work on distributed and asynchronous systems using message queues, background workers, and event-driven workflows. ...

Principal Engineer

Hiring Organisation
Arrive
Location
City Of London, England, United Kingdom
technical initiatives across multiple teams Experience designing scalable, high-performance systems Experience working with legacy or monolithic systems and modernising them Strong understanding of API design and distributed systems Knowledge of modern engineering practices, including CI/CD and DevSecOps Understanding of secure development practices such as OWASP ...

Junior Back-end Engineer

Hiring Organisation
ivee
Location
City of London, London, United Kingdom
maintain server-side logic using modern backend frameworks (e.g. Node.js, Python, Go) Work with APIs — designing, integrating, and maintaining RESTful endpoints Support database design and optimisation (e.g. PostgreSQL, MongoDB) Collaborate with front-end and product teams to deliver full-stack features Write clean, testable, and maintainable code Help improve ...

Software Developer

Hiring Organisation
Quantock Talent Limited
Location
Reading, Berkshire, England, United Kingdom
Employment Type
Full-Time
Salary
£40,000 per annum
years of experience in software development with the Microsoft stack • Stack: C#, .Net Core, ASP.net • Microsoft SQL, Entity Framework • JavaScript, CSS, JSON, XML, etc • API Design & Best Practice (REST, SOAP) • Excellent understanding of Object-Oriented software design • Agile/SCRUM • Azure DevOps Server • Follow best practices ...

Senior Full Stack Software Engineer

Hiring Organisation
Bolt Technical Limited
Location
Milton Keynes, Buckinghamshire, South East, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£80,000
develop a LAMP-based full-stack platform Audit, refactor, and improve legacy code without full rewrites Introduce modern front-end frameworks (React, Vue, Angular) Design and maintain APIs (REST/GraphQL) Improve performance, security, and scalability Contribute to DevOps, CI/CD, and cloud infrastructure Mentor junior developers … best practices What Theyre Looking For Senior full-stack experience in a LAMP environment Strong PHP and MySQL skills Experience with modern JavaScript frameworks API design experience Comfortable in a hands-on, pragmatic, small-team environment Strong communication and problem-solving skills Package & Benefits ...

Full Stack Web Developer

Hiring Organisation
LM RECRUITMENT SOLUTIONS LTD
Location
Stroud, Gloucestershire, South West, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£55,000
full-stack technologies. Develop new features and functionality for both front-end and back-end components in following best practices. Implement and maintain robust API integrations with internal and third-party systems. Assist in monitoring, troubleshooting, and resolving production issues to maintain system reliability and data integrity. Participate … reviews, testing, and documentation to maintain high standards of code quality. Required Skills & Experience Strong full-stack development experience with Laravel/PHP for API development and front-end frameworks such as Vue.js (or similar). Familiarity with Node.js for working on an existing LoopBack application. Experience with ...

Full Stack Engineer

Hiring Organisation
Humanoid
Location
London Area, United Kingdom
create the world’s leading, commercially scalable, safe, and advanced humanoid robots that seamlessly integrate into daily life and amplify human capacity. Responsibilities Design and implement a centralized cloud-based platform for managing a fleet of humanoid robots, monitoring system health, and visualizing fleet-level KPIs Develop robust backend … Expertise Proficiency in one of Python, Javascript, Golang or Rust Familiarity with React (or similar frameworks) for creating user-friendly web applications. Expertise in API design, data modeling, and distributed architectures Proficiency with CI/CD pipelines, containerization (e.g., Docker, Kubernetes), and workflow automation. Proficiency in infrastructure ...

Senior Backend Engineer

Hiring Organisation
Searchability®
Location
London Area, United Kingdom
Experience working on the engineering team in a start-up, scale-up or product-driven company Strong understanding and experience with building and consuming API-driven solutions. Experience with database technologies, cloud platforms (e.g., AWS, Azure, GCP), and API design principles. A minimum of a Bachelor ...

Back End Developer

Hiring Organisation
Albert Bow
Location
London Area, United Kingdom
+ mobile applications Building and maintaining high‐performance APIs and distributed microservices Solving problems around scalability, reliability, security, and automation Working with modern API protocols including GraphQL and gRPC Enhancing the platform that connects both traditional and on‐chain financial services Must‐have experience: Strong backend engineering background with …/or Golang Solid understanding of microservices, event‐driven systems & distributed architecture Strong knowledge of PostgreSQL and/or Redis Understanding of web semantics, API design & backend web standards Proficiency with Git and version control workflows Experience with CI/CD, build automation and modern engineering pipelines Excellent ...

Software Engineer

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
Nottingham, Nottinghamshire, England, United Kingdom
Employment Type
Full-Time
Salary
£45,000 - £60,000 per annum
infrastructure. THE ROLE: Key responsibilities include: Owning and maintaining AWS infrastructure (Lambda, Step Functions, DynamoDB, S3). Building and enhancing internal Python libraries (API design, releases, versioning). Managing trackers, Lambdas, Step Functions, DynamoDB tables, and API integrations (including Slack-based pipelines). Operating across the full … engineering lifecycle, from design through to production deployment. YOUR SKILLS AND EXPERIENCE: You will bring strong capability in: Python AWS services including Lambda, Step Functions, S3, DynamoDB, EC2/ECS. Infrastructure-as-code (Terraform or CloudFormation). CI/CD, testing, and software engineering best practices. THE BENEFITS ...

Software Engineer

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
Manchester, Lancashire, England, United Kingdom
Employment Type
Full-Time
Salary
£45,000 - £60,000 per annum
infrastructure. THE ROLE: Key responsibilities include: Owning and maintaining AWS infrastructure (Lambda, Step Functions, DynamoDB, S3). Building and enhancing internal Python libraries (API design, releases, versioning). Managing trackers, Lambdas, Step Functions, DynamoDB tables, and API integrations (including Slack-based pipelines). Operating across the full … engineering lifecycle, from design through to production deployment. YOUR SKILLS AND EXPERIENCE: You will bring strong capability in: Python AWS services including Lambda, Step Functions, S3, DynamoDB, EC2/ECS. Infrastructure-as-code (Terraform or CloudFormation). CI/CD, testing, and software engineering best practices. THE BENEFITS ...

Senior Python Engineer

Hiring Organisation
Harvey Nash
Location
Birmingham, West Midlands, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 per annum
days per week onsite Salary up to £70,000 per annum A leading Birmingham-based client is seeking a Senior Python Engineer to design, build, and deploy applications using Python frameworks and LLM APIs. The position focuses on developing scalable, secure AI services in Azure's public cloud … involves hands-on work throughout the development lifecycle, including API design, data access, AI integration, and cloud deployment. Key skills and responsibilities: Design, develop, and maintain AI-driven applications and services utilising Python. Build and manage RESTful APIs with FastAPI. Integrate and oversee Large Language Models ...

Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK)

Hiring Organisation
Transreport
Location
London Area, United Kingdom
architecture Extensive experience with PostgreSQL, including performance tuning and complex queries. Experience with background job processing using Sidekiq and Redis. Solid understanding of RESTful API design, JSON serialization, and authentication (e.g., JWT, SSO). Hands-on experience with AWS services and containerised deployments (Docker). Experience troubleshooting ...

AI Platform Engineer

Hiring Organisation
The Portfolio Group
Location
London, Castle Baynard, United Kingdom
Employment Type
Permanent
owning the cloud-native platform that underpins conversational AI and generative AI products at scale. Sitting at the core of AI delivery, you will design, build, and operate the runtime, infrastructure, and operational layers supporting RAG pipelines, LLM orchestration, vector search, and evaluation workflows across AWS and Databricks. Working … platform powering conversational assistants and generative AI products. Build, operate, and optimise RAG and LLM-backed services, improving latency, reliability, and cost. Design and run cloud-native AI services across AWS and Databricks, including ingestion and embedding pipelines. Scale and operate vector search infrastructure (Weaviate, OpenSearch, Algolia, AWS Bedrock ...

Product Engineer

Hiring Organisation
Affinity Labs
Location
London Area, United Kingdom
full-stack product delivery, from infrastructure and AI integrations through to React/React Native interfaces, collaborating closely with founders, creators, product, and design to turn lean specs into scalable, user-loved software. We’re looking for a strong generalist with backend depth and real mobile experience. Responsibilities Implement … mobile + web frontend → APIs → data models → integrations) while maintaining quality and velocity. Build React Native mobile apps and shared component systems across products. Design and ship scalable backend services (APIs, integrations, AI workflows). Run tight build → test → iterate → ship loops; provide realistic estimates and surface blockers early. ...

Core Software Engineer

Hiring Organisation
Aries Global
Location
London Area, United Kingdom
seasoned technical leaders. What matters is how you think, build, and ship. You'll take end-to-end ownership of features from architecture design to measurable impact — shipping code that directly moves revenue, retention, or product velocity. You'll design clean abstractions in ambiguous environments, evolve systems into … . We care about outcomes, not activity. What We're Looking For You've built and shipped real systems. You understand data modelling, API design, system trade-offs, testing, and reliability. You know how to move fast without creating chaos. You're strong in at least one modern ...